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Definitions
% OUT - Current percent modulation rate of heater.
BOIL DSGN - Design boiler water temperature used in
heat loss calculations.
BOIL MASS - This setting allows adjustment in the
field for high or low thermal masses; High thermal
mass (setting=3) provides slower reaction, lower ther-
mal mass (setting=1) provides faster reaction.
BOIL MAX - Highest outlet water temperature that the
control is allowed to use as a target temperature.
BOIL MIN - Lowest outlet water temperature that the
control is allowed to use as a target temperature.
BOIL ON - Accumulated runtime of heater (up to 999
hours, then resets to 0).
BOIL OUT - Actual heater outlet water temperature.
BOIL START - Starting boiler water temperature.
BOIL SUP - Actual system supply water temperature.
BOIL TARGET - Target temperature that the heater is
trying to maintain.
‘BURNER’ DELAY - Holds control output at ignition
setting from the start of the ignition sequence to the
specified burner delay time (0 to 3:00 min.).
DEM 1 - Indicates 24 VDC signal has been supplied to
the H+D terminal.
DEM 2 - Indicates 24 VDC Flame Proof signal is pres-
ent.
DIFF - The operating differential of the heater; The
heater outlet water temperature is allowed to rise
above the BOIL TARGET temperature by
1
⁄2 of this dif-
ferential before the heater shuts off. For example, if
the heater target temperature is set to 160°F (71°C)
and the differential is set to 10°F (5°C), on temperature
rise, the heater will shut off at 165°F (74°C). Once the
heater shuts off, it will not come on again until the tem-
perature falls to 155°F (68°C).
EXTERNAL INPUT SIGNAL – Selects external input
signal range (0-10VDC or 2-10VDC):
Water Heater (WH1)
Item Modes Default Setting Range
Boil Target
1, 2 140°F OFF, 70 to 190°F
3, 6, 7 160°F OFF, 70 to 190°F
Boil Max 1, 2, 3, 6, 7 180°F OFF, 120 to 190°F
Boil Min 1, 2, 3, 6, 7 135°F OFF, 80 to 180°F
‘Burner’ Delay All 0:00 min 0:00 to 3:00 min
Boil Mass All 1 (Low) 1 (Low), 2 (Med), 3 (High)
Diff 1, 2, 3, 6, 7 Auto Auto, 2 to 42°F
DHW Target 3 120°F OFF, 70 to 190°F
DHW Diff 3 5°F 2 to 10°F
‘Pump’ Dly All 3:00 min OFF, 0:20 to 9:55 min, ON
Units All °F °F or °C
Mode N/A 3 1, 2, 3, 6, 7
External Input Signal 6, 7 2 to 10 VDC 2 to 10 VDC or 0 to 10 VDC
Offset 6, 7 0°F -10°F to 10°F
Table Q: Modulating Temperature Control Default Setpoints—Water Heater
NOTE: The defined terms are not active in all
modes of control operation.